Dunkirk Oil Boilers

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2600 - 2899 (8)

2900 - 3199 (9)

3200 - 3499 (7)

3500 - 3799 (5)

3800 - 4099 (3)

4100 - 4399 (1)

4400 - 4699 (4)

4700 - 4999 (2)

5000 - 5299 (1)

Net I=B=R Capacity (BTU)
I=B=R, also referred to as Net Output or AHRI Capacity, is the rated heat output of a boiler after accounting for combustion efficiency, piping loss, and an extra pickup factor. We recommend sizing steam boilers based on the I=B=R rating.

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70000 - 79999 (4)

80000 - 89999 (4)

90000 - 99999 (4)

100000 - 109999 (4)

110000 - 119999 (3)

120000 - 129999 (4)

130000 - 139999 (4)

140000 - 149999 (2)

150000 - 159999 (4)

160000 - 169999 (2)

170000 - 179999 (1)

180000 - 189999 (4)

DOE Heating Capacity (BTU)
Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.

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80000 - 89999 (2)

90000 - 99999 (4)

100000 - 109999 (2)

110000 - 119999 (4)

120000 - 129999 (4)

130000 - 139999 (3)

140000 - 149999 (4)

150000 - 159999 (4)

160000 - 169999 (2)

170000 - 179999 (4)

200000 - 209999 (1)

210000 - 219999 (2)

240000 - 249999 (4)

AFUE (%)
AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace. Learn More

82 (8)

84 (7)

84.3 (2)

85 (8)

85.2 (2)

86 (5)

86.3 (2)

86.5 (6)

Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.

Chimney Vent (34)

Direct Vent (6)

Medium
Medium refers to the substance that carries heat through the heating system. Systems are either designed to use either Hot Water or Steam as a medium, and components are usually specific to one or the other.

Hot Water (32)

Steam (8)

Product Line

ESC IV (8)

Empire Water II (16)

Excelsior EXB (16)

DHW Production
DHW (Domestic Hot Water) is potable water for uses other than space heat. Some boilers are able to provide DHW "out of the box", while others can do so with the purchase of optional accessories.